Pouch Cell Heat Transfer Layer for Electrode Temperature Control
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Solution Overview
Problem
Existing electrical storage devices face challenges in effectively managing heat generated by electrode assemblies, as increasing the thickness of the water vapor-impermeable layer to suppress temperature rise compromises the productivity of the laminate film.
Innovation Solution
An electrical storage device design incorporating an outer packaging with a heat transfer material attached to its surface, featuring a heat transfer layer with a metal content equal to or greater than the exterior barrier layer, which aids in efficiently transferring heat to a cooling mechanism while maintaining a thin exterior barrier layer to preserve productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the thickness of the water vapor-impermeable layer is increased to suppress temperature rise, then heat transfer performance is improved, but productivity of the laminate film deteriorates
Solution Approach 1:
The patent divides the heat transfer function into two separate components: the exterior barrier layer (water vapor-impermeable layer) and the heat transfer material. The heat transfer material is attached to the outer packaging surface, while the exterior barrier layer maintains its original thin thickness for productivity. This segmentation allows each component to optimize its thickness independently - the heat transfer material can be sufficiently thick for heat dissipation without compromising the productivity of the laminate film structure.
Solution Approach 2:
The patent transitions from a single-dimensional thickness increase of the exterior barrier layer to a two-dimensional solution by attaching heat transfer material to the outer packaging surface. This dimensional change allows heat transfer enhancement without increasing the thickness of the water vapor-impermeable layer, thereby maintaining laminate film productivity while achieving effective heat dissipation.
2Temperature
If the thickness of the exterior barrier layer is increased to enhance heat transfer, then temperature control is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the thermal management system into the exterior barrier layer and the separately attached heat transfer material. This segmentation simplifies the manufacturing process compared to producing a single thick laminate film, as the heat transfer material can be applied as a separate component to the outer packaging, reducing overall structural complexity while maintaining effective temperature control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively suppresses excessive temperature rise in the electrode assembly by enhancing heat transfer without compromising the laminate film's productivity, as the heat transfer material's thickness matches or exceeds the exterior barrier layer, ensuring efficient heat dissipation and improved manufacturing efficiency.
Implementation Method 1
If an electrode assembly generates heat in the electrical storage device, a part of the heat is transferred to a metal forming the water vapor-impermeable layer and released to the outside. Therefore, an excessive rise in temperature of the electrode assembly is suppressed.
Data Source
AI summary
A power storage device includes: an electrode body; an exterior body including an exterior film sealing the electrode body; and a heat transfer body attached to at least a portion of the surface of the exterior body. The exterior film includes at least a base material layer, an exterior barrier layer, and a heat-fusible resin layer. The exterior barrier layer is constituted of a material containing a metal, the heat transfer body includes a heat transfer layer constituted of a material containing a metal, and the thickness of the heat transfer layer is equal to or greater than the thickness of the exterior barrier layer.